CN117323042A - Method, device, equipment and medium for filling undercut of tooth model - Google Patents
Method, device, equipment and medium for filling undercut of tooth model Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 43
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- 238000000605 extraction Methods 0.000 claims description 2
- 229940127554 medical product Drugs 0.000 description 17
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- 238000005056 compaction Methods 0.000 description 6
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/34—Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0004—Computer-assisted sizing or machining of dental prostheses
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Abstract
The present disclosure relates to a method, apparatus, device and medium for filling an undercut of a dental model, the method comprising: acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of which is composed of a plurality of triangular patches; constructing an empty space distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model; determining a plurality of candidate space lattices associated with the undercut region in the space distance field for the undercut region of any tooth model; and modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave area. The method and the device can improve the accuracy of the filling result of the undercut region.
Description
Technical Field
The disclosure relates to the technical field of intelligent stomatology, in particular to a method, a device, equipment and a medium for filling undercut of a tooth model.
Background
For dental patients, it is often necessary to apply various medical products to the teeth, and the problem of whether the products can be worn and whether they are tight after being worn is involved in the wearing process of the products. The degree of compaction of the medical product is closely related to the undercut of the teeth. When designing dental medical products, it is often necessary to perform a filling operation on the original tooth model to adjust the degree of compaction of the medical product.
In the prior art, the undercut is filled in proportion, namely, the undercut is filled in a certain proportion according to the maximum value; however, this approach is highly uncertain, which can result in inaccurate filling of the undercut region of the final medical product, which can result in an improper level of compaction of the medical product, which can make it inconvenient or uncomfortable for the dental patient to wear the medical product.
Disclosure of Invention
In order to solve the technical problems, the present disclosure provides a method, a device, equipment and a medium for filling the undercut of a tooth model.
According to an aspect of the present disclosure, there is provided a method of filling an undercut of a dental model, comprising:
acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of the tooth model and the gum model being composed of a plurality of triangular patches; constructing an empty space distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model; determining a plurality of candidate space lattices associated with the undercut regions in the inter-space distance field for the undercut regions of any one of the tooth models; and modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave area.
According to another aspect of the present disclosure, there is provided an apparatus for filling an undercut of a dental model, comprising:
the model acquisition module is used for acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of the tooth model and the gum model being composed of a plurality of triangular patches;
the distance field construction module is used for constructing an air distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model;
a grid determining module, configured to determine, for an undercut region of any of the tooth models, a plurality of candidate space lattices associated with the undercut region in the inter-space distance field;
and the distance value modifying module is used for modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave region.
According to another aspect of the present disclosure, there is also provided an electronic apparatus including:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described above.
According to another aspect of the present disclosure, there is also provided a computer-readable storage medium storing a computer program for executing the above method.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the method, device, equipment and medium for filling the undercut of the tooth model provided by the embodiment of the disclosure comprise the following steps: acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of which is composed of a plurality of triangular patches; constructing an empty space distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model; determining a plurality of candidate space lattices associated with the undercut region in the space distance field for the undercut region of any tooth model; and modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave area. According to the technical scheme, the speed of filling the inverted concave area in the space distance field is higher; and as the first distance value in the space-distance field can represent the curve form of the tooth surface, the first distance value of the candidate space lattice of the undercut region is modified to fill the undercut region, so that the filled angle and distance are more accurate and controllable, the accuracy and quality of the undercut filling model are improved, the filling result of the undercut region of the final medical product is more accurate, the compaction degree of the medical product is more correct, and the dental patient wears the medical product more conveniently or comfortably.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method for filling an undercut in a dental model according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a three-dimensional dental model according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a spatial distance field at different viewing angles according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a tooth model according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a spatial distance field at different filling-up-recession ratios according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a spatial distance field at different undercut angles in an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a spatial distance field under different gaps according to an embodiment of the disclosure;
FIG. 8 is a schematic diagram of a spatial distance field under different gaps according to an embodiment of the present disclosure;
FIG. 9 is a schematic structural view of an apparatus for filling an undercut in a dental model according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
Considering that the existing way of filling the undercut in proportion is highly uncertain, this can lead to problems such as: the filling result of the undercut region may be inaccurate, the degree of compaction of the medical product is not proper, and it is inconvenient or uncomfortable for the dental patient to wear the medical product. Based on the above, the embodiment of the disclosure provides a method, a device, equipment and a medium for filling undercut of a tooth model. For ease of understanding, embodiments of the present disclosure are described below.
Fig. 1 is a flowchart of a method for filling a recess in a tooth model according to an embodiment of the present disclosure, where the method may be performed by a device configured at a terminal and used for filling a recess in a tooth model, and the device may be implemented in software and/or hardware. As shown in fig. 1, the method of filling the undercut of the dental model may include the following steps.
S102, acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of which is composed of a plurality of triangular patches.
It is contemplated that tissue undercut refers to the area under the ridge of the remaining tooth or arch contour that, when viewed in cross-section, prevents dental products such as dentures, retainers, night-tooth pads, etc., from being worn in place, the undercut area being associated with both the teeth and gums. Based on this, the present embodiment needs to acquire a tooth model and a gum model in the three-dimensional dental model.
In this embodiment, a three-dimensional dental model composed of triangular patches may be acquired first; and then carrying out region segmentation on the gingival region and the tooth region in the three-dimensional dental model according to a region segmentation algorithm to obtain a gingival model corresponding to the gingival region and a tooth model corresponding to each tooth in the tooth region one by one.
The present embodiment may globally scan upper teeth or lower teeth of a human mouth using an oral scanning apparatus, acquire a plurality of scan images, and generate a tooth global three-dimensional dental model based on the plurality of scan images, the three-dimensional dental model may include an upper dental model and a lower dental model, wherein the lower dental model may refer to the model shown in fig. 2, in which the three-dimensional dental model under both a top view and a plan view is shown. The three-dimensional dental model in this embodiment is composed of a plurality of triangular patches, with the purpose of restoring the three-dimensional shape of teeth through the triangular patches.
When the Region segmentation is carried out on each tooth on the three-dimensional dental model, a deep learning model such as R-CNN (Region-Convolutional Neural Networks, regional convolution neural network) can be adopted, and the Region segmentation is carried out on the gingiva and each individual tooth on the three-dimensional dental model according to a Region segmentation algorithm, so that an integral gingiva model and a tooth model of each tooth are obtained, and the gingiva model and the tooth model are also formed by triangular patches.
S104, constructing an empty space distance field for the three-dimensional dental model; wherein the spatial distance field comprises: the first distance value between the space lattice and the tooth model and between the space lattice and the gum model.
The present embodiment may generate an inter-space distance field for a three-dimensional dental model in the following manner, including: dividing a three-dimensional space surrounding the three-dimensional dental model into a plurality of space lattices; calculating a shortest first distance value between the space and the tooth model and between the space and the gum model; each space grid and the first distance value corresponding to each space grid are constructed to be space distance fields.
In the specific implementation, an outer surrounding box which surrounds the three-dimensional dental model and extends outwards for a specified distance in the three directions of length, width and height can be generated outside the three-dimensional dental model. In three-dimensional space, the external bounding box completely encloses the three-dimensional dental model. The three-dimensional space defined by the outer peripheral box is divided into a plurality of space compartments according to a preset size. It will be appreciated that these compartments may be located inside and outside the three-dimensional dental model, or that the three-dimensional dental model may fall on portions of the compartments.
Traversing each space grid, and calculating the shortest distance value between the key points (such as center points or vertexes) of the space grid and the three-dimensional dental model, namely, the first distance value. In order to facilitate distinguishing the relative positional relationship between the space grid and the three-dimensional dental model, in this embodiment, the first distance value is defined as a positive value when the space grid is outside the three-dimensional dental model, as a negative value when the space grid is inside the three-dimensional dental model, and as a 0 when the space grid is on the surface of the three-dimensional dental model.
Each space grid and the first distance value corresponding to the space grid are constructed into a space distance field, and the space distance field comprises a plurality of space grids with the first distance value. As shown in fig. 3, the inter-space distance field of the three-dimensional dental model is shown at both a head-up view and a top view.
S106, determining a plurality of candidate space lattices associated with the undercut region in the space distance field aiming at the undercut region of any tooth model.
Wherein, for each tooth model in the three-dimensional tooth jaw model, a plurality of candidate space lattices associated with the undercut region are determined in the same way, and any tooth model is taken as an example for illustration.
Before determining a plurality of candidate cells associated with an undercut region, the present embodiment first determines an undercut region in a tooth model based on the in-situ canal direction of the tooth model and the normal vector of the triangular patch.
It will be appreciated that the size of the undercut region is determined by the degree of curvature of the oral cavity inner surface and the direction of the seated tract. Wherein the oral cavity inner surface comprises the outer surface of the teeth and the outer surface of the gums. In particular implementations, then, the track direction of the current tooth model and the plurality of triangular patches that make up the gingival model and the tooth model are acquired. The inner product between the normal vector of each triangular patch and the in-situ canal direction of the tooth model is calculated. And under the condition that the inner product is smaller than 0, determining the corresponding triangular surface patch as the inverted concave area triangular surface patch. Based on which a undercut region triangular patch is determined from a plurality of triangular patches constituting the gum model and the tooth model. The triangular surface patch of the undercut region and the tooth gap region below the triangular surface patch are undercut regions.
The embodiment can also mark each undercut region on the three-dimensional dental model by adopting marks such as colors, lines and the like, so that the undercut regions are more visual and obvious, and the undercut regions are convenient to be filled.
In a spatial distance field, the undercut region may fall into a plurality of spatial bins. In this embodiment, for an undercut region of any tooth model, an embodiment of determining a plurality of candidate spaces associated with the undercut region may be referred to as follows.
Determining a plurality of first space lattices located in the undercut region in the space distance field; extracting second space lattices with equal distance values with the first space lattices around each first space lattice; and determining the first space grid and the second space grid as candidate space grids associated with the undercut region.
Specifically, a first distance value of a first space and a first space directly falling in the undercut region is determined.
Adjacent or nearby compartments may be considered to be continuous, with the first distance between the compartments and the tooth model being such that no abrupt changes occur. Then, at the time of determining a first space p 1 And a first distance value d thereof 1 (false)Let d 1 =5 cm), there are other space cells p with the first distance value of 5 cm at the position not far around the first space cell 2 First space lattice p 1 With other space lattices p 2 With continuity of curvature therebetween. Further, second space lattices with equal distance values to the current first space lattice are extracted around each first space lattice; the first distance value between the current first space grid and the second space grid extracted by the current first space grid is equal. And determining the first space grid and the second space grid as candidate space grids associated with the undercut region. Because the first space lattice in the candidate space lattices is a grid in the inverted concave area, and the second space lattice is a grid with equal distance value and continuous curvature with the first space lattice, the curved surface formed by the candidate space lattices can be matched with the tooth surface curved surface in the inverted concave area.
S108, modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave area.
In this embodiment, the first distance value of each candidate space is modified first to obtain the second distance value.
A distance value modification may include:
a maximum distance value of the first distance values of the plurality of candidate space bins is determined. Each candidate space bin has a respective first distance value from which a maximum distance value is determined. As shown in fig. 4, the tooth model is set to be in a y direction from top to bottom, and is set to be in an x direction perpendicular to the y direction, or in other words, the y direction is a vertical direction, and the x direction is a horizontal direction. Wherein the candidate space corresponding to the maximum distance value is generally the space along the x-direction and passing through the root of the tooth, such as candidate space p 3 In the undercut region, the candidate space lattice p is shown 3 Furthest from the tooth model surface.
The modification ratio is determined based on the maximum distance value. And modifying the first distance value of each candidate space according to the modification proportion to obtain a second distance value. Wherein the second distance value=λ×the first distance value, λ being the modification ratio.
Another way of modifying the distance value may include:
and determining the minimum distance value between each candidate space and the side surface of the tooth model along the up-down direction according to the preset model drawing angle. As shown in fig. 4, the teeth are generally in a shape with a wide upper portion and a narrow lower portion, so that there is a point of the protrusion on the tooth model, tangential sides passing through the point on the curved surface of the tooth model and sides in the up-down direction are determined, and for convenience of description, sides in the up-down direction are referred to as vertical planes. The included angle formed between the tangential side surface and the vertical surface is a draft angle.
From the draft angle, the tangent of the candidate space bin in the x-direction, i.e. the minimum distance between the candidate cube model and the vertical plane, can be calculated. With candidate space lattice p in figure 4 4 For example, its first distance value is d 1 A minimum distance value d 2 。
And modifying the first distance value of each candidate space according to the minimum distance value to obtain a second distance value. It will be appreciated that the minimum distance value is the difference between the distance values of the candidate space lattice and the non-undercut region, representing the distance between the candidate space lattice p 4 It is necessary to fill the minimum distance value d 2 . Based on this, the following formula can be referred to, according to the minimum distance value d 2 First distance value d to candidate space 1 Modifying to obtain a second distance value d 1 '：d 1 '＝d 1 +d 2 . The candidate space bin at the modified second distance value will be as p 5 As shown. It can be seen that candidate space lattice p 5 Is positioned in the non-undercut region.
After the modified second distance value of each candidate space grid is determined, performing iso-surface extraction on the space distance field according to the second distance value to obtain a target space grid; that is, the space lattice with the distance value of the second distance value is extracted from the space distance field, and the target space lattice is obtained.
And then, connecting the target space grid into a curved surface through the triangular surface patch to obtain the inverted concave filling model for filling the inverted concave area. In the embodiment, the inverted concave filling model corresponding to the inverted concave area of each tooth is utilized, so that the inner surface and/or the outer surface of a medical product can be generated; such as a night dental pad, a retainer, an bite pad, a denture, a temporary crown bite pad, and the like.
According to the above embodiments, several examples of undercut padding models are provided below with different undercut angles, different gaps.
In some examples, referring to fig. 5, a schematic diagram of a target space grid that extracts a second distance value in a space distance field at several different undercut fill ratios of 100%, 50%, and 20% is shown; in the spatial distance field, different undercut ratios are distinguished by different gray values. The filling undercut ratio of 0 means that the undercut region is not filled, and the filling undercut ratio of 100% means that the undercut region is filled 100%, and the undercut region is completely filled. A 50% filling of the undercut region indicates a 50% filling of the undercut region. A 20% filling of the undercut region means that the undercut region is 20% filled.
As shown in fig. 6, a schematic diagram of an undercut filling model is shown that extracts a second distance value in a spatial distance field at two undercut angles, 0 ° and 30 °, and thereby fills the undercut region. Wherein, the solid line represents the relative position relationship between the generated undercut filling model and the tooth model (also can be said to be medical product and tooth) when the undercut angle is 0 degrees, and the undercut filling region is not filled between the undercut filling model and the tooth model. The dashed line indicates the relative positional relationship between the generated undercut filling model and the tooth model when the undercut angle is 30 °, and the undercut region between the undercut filling model and the tooth model needs to be filled.
Filling the undercut in a conical range which forms a certain angle with the direction of the locating channel according to the undercut angle. When the undercut angle is 0 °, filling of the undercut in a conical range of 0 degrees from the track direction is indicated, and only the immediately below of the undercut region is filled, and filling of a large conical range with a small upper surface and a large lower surface is not formed.
When the undercut angle is not 0 deg., it means that filling is performed in a conical range of X degrees from the in-position track direction (X is a value given by the undercut angle), and only filling all spaces in which the included angle with the in-position track direction is smaller than X degrees, forming a large conical range filling with a small upper surface and a large lower surface. For example: the undercut angle of 30 ° means that filling the undercut in a conical range of 30 degrees from the in-place track direction results in a conical range filling region with a small upper face and a large lower face.
It should be noted that the specific numerical values of the undercut proportion and undercut angle are only illustrative and should not be construed as limiting.
In other examples, as shown in fig. 7, a schematic diagram of a target space bin extracting a second distance value in a space distance field under different gaps S1, S2 is shown; the gap refers to the size of the space reserved between the undercut filling model and the tooth model under the condition that the undercut angle is fixed. In the spatial distance field, different gaps are distinguished by different gray values. In fig. 7, it can be seen that the gap S1 is smaller than the gap S2 by the color areas of different gray values. Referring to fig. 8, a schematic diagram of an inverted fill model for filling an inverted region is shown, in which target space bins for a second distance value are extracted in a spatial distance field at two gaps S1 and S2, respectively. The gap between the inverted filling model and the tooth model in the left diagram of fig. 8 is S1, and the gap between the inverted filling model and the tooth model in the right diagram of fig. 8 is S2.
In the above embodiment, since the first distance value is a distance value of the space grid from the tooth model surface, the curve form of the tooth surface is well reflected, and then, based on the second distance value after the first distance value is modified, the curve form of the tooth surface can also be reflected, further, the target space grid extracted by the second distance value can conform to the tooth surface form, and then, the target space grid is connected into a curved surface through the triangular surface patch to increase the surface smoothness of the undercut filling model, the undercut filling model obtained in the above manner can well adapt to the surface form of the tooth, has a smooth curved surface, and improves the adaptation degree between the undercut filling model and the dental product designed thereby and the tooth.
In summary, a method for filling an undercut in a tooth model provided in an embodiment of the present disclosure includes: obtaining a tooth model which is formed by a plurality of triangular patches and corresponds to each tooth in the three-dimensional dental model; constructing an empty space distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model; determining a plurality of candidate space lattices associated with the undercut region in the space distance field for the undercut region of any tooth model; and modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave area. According to the technical scheme, the speed of filling the inverted concave area in the space distance field is higher; and because the first distance value in the space-to-space distance field can reflect the curve form of the tooth surface, the first distance value of the candidate space lattice of the undercut region is modified to fill the undercut region, so that the filled angle and distance are more accurate and controllable, the accuracy and quality of the undercut filling model are improved, the filling result of the undercut region of the final medical product is more accurate, the compaction degree of the medical product is more correct, and the dental patient wears the medical product more conveniently or comfortably.
Further, the matching degree of the dental product designed based on the inverted concave filling model and the teeth of the user is higher, the dental product can be easily and smoothly buckled on the teeth or taken down from the teeth, certain clamping degree can be ensured, the dental product is not loosened, and the wearing comfort of the dental product is improved.
Fig. 9 is a schematic structural diagram of a device for filling an undercut in a tooth model according to an embodiment of the present disclosure, where the device may be used to implement the method for filling an undercut in a tooth model. As shown in fig. 9, the device for filling the undercut of the tooth model may include the following modules.
A model acquisition module 210 for acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of the tooth model and the gum model being composed of a plurality of triangular patches;
a distance field construction module 220 for constructing an air distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model;
a grid determining module 230, configured to determine, for an undercut region of any of the tooth models, a plurality of candidate space-lattices associated with the undercut region in the inter-space distance field;
and the distance value modifying module 240 is configured to modify the first distance value of each candidate space to obtain an inverted concave filling model for filling the inverted concave region.
The device provided in this embodiment has the same implementation principle and technical effects as those of the foregoing method embodiment, and for brevity, reference may be made to the corresponding content of the foregoing method embodiment where the device embodiment is not mentioned.
Fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure. As shown in fig. 10, the electronic device 300 includes one or more processors 301 and memory 302.
The processor 301 may be a Central Processing Unit (CPU) or other form of processing unit having data processing capabilities and/or instruction execution capabilities and may control other components in the electronic device 300 to perform desired functions.
Memory 302 may include one or more computer program products that may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random Access Memory (RAM) and/or cache memory (cache), and the like. The non-volatile memory may include, for example, read Only Memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer readable storage medium that can be executed by the processor 301 to implement the method of filling a dental model undercut and/or other desired functions of the embodiments of the present disclosure described above. Various contents such as an input signal, a signal component, a noise component, and the like may also be stored in the computer-readable storage medium.
In one example, the electronic device 300 may further include: an input device 303, and an output device 304, which are interconnected by a bus system and/or other forms of connection mechanisms (not shown).
In addition, the input device 303 may also include, for example, a keyboard, a mouse, and the like.
The output device 304 may output various information to the outside, including the determined distance information, direction information, and the like. The output device 304 may include, for example, a display, speakers, a printer, and a communication network and remote output devices connected thereto, etc.
Of course, only some of the components of the electronic device 300 relevant to the present disclosure are shown in fig. 10 for simplicity, components such as buses, input/output interfaces, etc. are omitted. In addition, the electronic device 300 may include any other suitable components depending on the particular application.
Further, the present embodiment also provides a computer-readable storage medium storing a computer program for executing the above method of filling the undercut of the tooth model.
The embodiment of the disclosure provides a method, an apparatus, an electronic device, and a computer program product of a medium for filling an undercut of a tooth model, which includes a computer readable storage medium storing program codes, where the program codes include instructions for executing the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment and will not be described herein.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of filling an undercut in a dental model, comprising:
acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of the tooth model and the gum model being composed of a plurality of triangular patches;
constructing an empty space distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model;
determining a plurality of candidate space lattices associated with the undercut regions in the inter-space distance field for the undercut regions of any one of the tooth models;
and modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave area.
2. The method of claim 1, wherein the generating an inter-space distance field for the three-dimensional dental model comprises:
dividing a three-dimensional space surrounding the three-dimensional dental model into a plurality of space lattices;
calculating a shortest first distance value between each space and the tooth model and between each space and the gum model;
and constructing each space grid and the first distance value corresponding to each space grid as a space distance field.
3. The method of claim 1, wherein determining a plurality of candidate space-boxes associated with the undercut region in the inter-space distance field comprises:
determining a plurality of first space lattices located in the undercut region in the space-distance field;
extracting second space grids with equal distance values from the first space grids around each first space grid;
and determining the first space grid and the second space grid as candidate space grids associated with the undercut region.
4. The method of claim 1, wherein modifying the first distance value of each of the candidate space boxes to obtain an inverted padding model that pads the inverted region comprises:
modifying the first distance value of each candidate space to obtain a second distance value;
performing iso-surface extraction on the space distance field according to the second distance value to obtain a target space grid;
and connecting the target space grid into a curved surface through a triangular surface patch to obtain the inverted concave filling model for filling the inverted concave area.
5. The method of claim 4, wherein modifying the first distance value for each of the candidate spaces to obtain a second distance value comprises:
determining a maximum distance value among the first distance values of the plurality of candidate space lattices;
determining a modification proportion according to the maximum distance value;
and modifying the first distance value of each candidate space according to the modification proportion to obtain a second distance value.
6. The method of claim 4, wherein modifying the first distance value for each of the candidate spaces to obtain a second distance value comprises:
determining a minimum distance value between each candidate space and the side surface of the tooth model along the up-down direction according to a preset model drawing angle;
and modifying the first distance value of each candidate space according to the minimum distance value to obtain a second distance value.
7. The method according to claim 1, wherein the method further comprises:
determining an undercut region in the tooth model based on the in-situ canal direction of the tooth model and the normal vector of the triangular patch.
8. An apparatus for filling an undercut in a dental model, comprising:
the model acquisition module is used for acquiring a three-dimensional dental model; wherein the three-dimensional dental model comprises: a tooth model and a gum model, each of the tooth model and the gum model being composed of a plurality of triangular patches;
the distance field construction module is used for constructing an air distance field for the three-dimensional dental model; wherein the spatial distance field comprises: a first distance value between the space grid and the tooth model and between the space grid and the gum model;
a grid determining module, configured to determine, for an undercut region of any of the tooth models, a plurality of candidate space lattices associated with the undercut region in the inter-space distance field;
and the distance value modifying module is used for modifying the first distance value of each candidate space lattice to obtain an inverted concave filling model for filling the inverted concave region.
9. An electronic device, the electronic device comprising:
a processor;
a memory for storing the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any of the preceding claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein instructions, which when run on a terminal device, cause the terminal device to implement the method according to any of claims 1-7.
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| CN202311237608.1A CN117323042A (en) | 2023-09-22 | 2023-09-22 | Method, device, equipment and medium for filling undercut of tooth model |
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| CN202311237608.1A CN117323042A (en) | 2023-09-22 | 2023-09-22 | Method, device, equipment and medium for filling undercut of tooth model |
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